The World of Harry Potter App

Hi everyone!
There's a new Harry Potter app on the iTunes App Store. Since it's licensed by Warner Bros. and approved by J. K. Rowling's team, I guess it can be considered as official. It has more than 1,600 questions from the 8 movies. I've played it and its kind of easy at the beginning and then it becomes more difficult.
They only downside I've seen is that it's not available in the U.S., but I saw it in the U.K. store, rest of Europe and rest of the world.
Has anyone tried it yet? Any comments?